2. Subscribe to the Signalboost Announcements and Helpline channel
Send HELLO to +1-947-800-5717 (that's 947-BOOST-IT!)
Send INFO to see details about the channel.
Send HELP to see the other commands you can use.
3. Request your own channel:
Send a Signal message to +1-947-800-5717 that includes channel name and the phone numbers of at least 2 admins. For example:
Test Channel +1-123-555-5555, +1-123-555-5555
You will receive a welcome message from your new channel phone number as soon as your channel is created.
You can write our helpline with questions or a request for a more in-depth training, and we'll get back to you asap!
4. Get subscribers and send announcements
Now, any anyone who sends "HELLO" to your channel number will get announcements you send out!
A Signalboost channel is a phone number that keeps track of admins and subscribers. Any time an admin sends a message to the channel, it is interpreted as a command or a broadcast. If admins send a broadcast, all of the subscribers will see it, but Signalboost will route the broadcast so that it appears as if coming from the channel phone number.
People have described Signalboost as "BCC, but for messaging," "secure SMS blasts," and "Celly, but over Signal."
Commands & languages
A command is a word or phrase sent as a Signal message that Signalboost will interpret as an instruction. Some commands can only be used by admins. If you're unsure which command to use, the HELP command is a great place to start.
Signalboost currently supports English, Spanish, French, and German. To switch to your language of choice, type the name of the language into the channel. For example, if I want to switch my language to Spanish, I would send "ESPAÑOL" to the channel.
By default, messages on Signalboost channels disappear after 1 week. However, admins and admins only can override the 1-week duration using the disappearing message timer in the top right hand corner of the Signal app. We recommend shortening the duration of disappearing message timer (usually to 1 day or 6 hours) if your broadcasts will contain sensitive information.
How do I get people to join my channel?
How do I broadcast a message?
If you are a channel admin (i.e., the person who requested the channel), simply send a message to your channel phone number to broadcast. Here's a short video of what that looks like.
How do I respond to a hotline message?
Incoming hotline messages are followed by a hotline #:
Hello! We need a legal representative at jail support location XYZ.
In order to respond to a hotline message, type REPLY:
REPLY #3214 Okay, we are sending someone over!
And the subscriber you replied to will receive the following message:
[PRIVATE REPLY FROM ADMINS]
Okay, we are sending someone over!
How can I see a list of commands I can use?
HELP lists the possible commands you can use.
How can I see my channel name, description, and how many people are subscribed?
INFO shows stats and briefly explains how Signalboost works.
Managing your channel
ADD / REMOVE +1-555-555-5555
Adds or removes +1-555-555-5555 as an admin of the channel. Any admins can remove or add any other admins.
RENAME new name
Renames channel to "new name"
RENAME My Cool Signalboost Channel
DESCRIPTION description of channel
Adds or updates public description of channel.
DESCRIPTION This is the _super cool activist_ signalboost channel! We'll use it to make announcements for the upcoming protest.
VOUCHING ON / OFF / ADMIN
VOUCHING ON: turning vouching on means that an invite (1 by default) is required to join the channel. Both admins and subscribers can invite people to the channel using the INVITE command.
VOUCHING OFF: this is the default behavior of the channel; anyone can join by sending HELLO to the channel number.
VOUCHING ADMIN: this means that an invite from an *admin* is required to join the channel. If other people try to send invites, they will be prevented from doing so.
Invites +1-555-555-5555 to subscribe to the channel. Remember to preface the phone number with a + and country code!
Multiple invites can be sent by listing phone numbers separated by commas:
INVITE +1-555-555-5555, +1-333-333-3333
VOUCH LEVEL level
This changes the number of invites needed to join the channel. For example:
VOUCH LEVEL 3
After executing this command, anyone who wants to join the channel will need 3 invites.
Managing a hotline
HOTLINE ON / OFF
Enables or disables a hotline, which allows admins to receive anonymous messages from subscribers. Channel hotlines are off by default. If you're an admin, you'll know that a message coming in is a hotline message because it will have the following header:
If you decide to turn the hotline on:
- Your subscribers' anonymity will be preserved when they message the hotline.
- Depending on the number of people subscribed to your channel, the hotline can be noisy and increase the chances of spam/abuse.
Other useful commands
PRIVATE good morning fellow admins!
Sends a private message to admins only (subscribers will not be able to see those messages).
ENGLISH / ESPAÑOL / FRANÇAIS / DEUTSCH
Switches language to Spanish, French, or German. Language changes on Signalboost are user-specific, so if you change your language to Spanish other admins and subscribers' channels will be unaffected.
Leaves the channel. If you're an admin, you will lose your admin access to the channel but will still be able to subscribe as a subscriber. If you want to obtain admin access again, you will need to ask a current admin to add you using the ADD command.
Danger zone! This command permanently destroys the channel and all associated records. Importantly, it does not erase the message history from admin and subscribers phones until the duration of the disappearing message timer is up.